Structural studies of adsorbed alkanethiols on Cu(111) by use of S and C K-edge X-ray absorption fine structures

被引:59
作者
Imanishi, A
Isawa, K
Matsui, F
Tsuduki, T
Yokoyama, T
Kondoh, H
Kitajima, Y
Ohta, T [1 ]
机构
[1] Univ Tokyo, Sch Sci, Dept Chem, Bunkyo Ku, Tokyo 113, Japan
[2] Natl Inst Mat & Chem Res, Higashi Ku, Tsukuba, Ibaraki 305, Japan
[3] High Energy Accelerator Res Org, Inst Mat Struct Sci, Photon Factory, Tsukuba, Ibaraki 305, Japan
关键词
alkanethiol; CH3(CH2)(5)SH; CH3(CH2)(11)SH; Cu(111); NEXAFS; surface; EXAFS;
D O I
10.1016/S0039-6028(98)00217-9
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Surface structures of submonolayer alkanethiol CH3(CH2)(n-1)SH (n=6,12) adsorbed on Cu(111) at room temperature (0.3 ML) were investigated by means of S K-edge surface extended X-ray absorption fine structure (EXAFS) and S, C K-edge near-edge X-ray absorption fine structure (NEXAFS) spectroscopies. Polarization dependence of the C K-edge NEXAFS spectra revealed that alkanethiol molecules adsorb with the tilt angle of 12+/-10 degrees from the surface normal. The S K-edge surface EXAFS determined that the S-Cu distance is 2.31+/-0.02 Angstrom and that the S atoms locate at a deep three-fold hollow site with significant lateral outward movements of the nearest neighbor Cu atoms. (C) 1998 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:282 / 292
页数:11
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